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12 speed is only useful if it gives you another useful gear ratio. A 12T is as small as I need. The cog choices on the HG800 Ultegra 11-34 have larger jumps at the small end - 11-13-15-17 - but closer spacing in the larger cogs where I do most of my riding. And I've changed the 11t to a 12T on two bikes. So a 12 speed would only be useful to me if the 11-34 went from 25-27-30-34 to 25-27-29-31-34, or to 12-36 with 12-14-16-18-20-22-24-26-28-30-33-36. Adding another 1T jump up at the small end would be marginal.
And do the systems get fussier to set up, and less durable? Not a given, surely, but my 11 speed stuff is fussier than all the 9 speed Ultegra/XT/XTR stuff I've been running for years.
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